Materials Performance

SEP 2018

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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16 SEPTEMBER 2018 W W W.MATERIALSPERFORMANCE.COM
MATERIAL MATTERS
Though investigators did not pinpoint a
precise cause for that thinning, the
report notes that moisture can f low
through and/or around the concrete
foundation and near the tanks because
there is no key way or water stop bet ween
the shell and foundation. This exposes
the secondar y steel containment liner to
moisture. The concrete foundation also
contains drains to a sump system.
In the short term, the next steps
include evaluating the effectiveness of
corrosion inhibitors and examining
methods to protect the outer shell exteri-
ors from water intrusion and humidity,
the report says. Core chemistry samples
will be collected more frequently to ana-
lyze waste at the bottom of tanks judged
to be most at risk.
To address these issues more specif i-
cally and receive feedback, the site has a
tank integrity expert panel comprised of
experts from a variety of private and U.S.
government organizations, including
national laboratories. The panel meets at
least once a year; and at these meetings,
panelists provide independent advice and
recommendations on existing and emerg-
ing tank integrity issues. The panel is also
evaluating potential tank repair tech-
niques for localized areas of corrosion.
The most recent meeting was held June
27-28, 2018, and another is expected
before the end of this year.
Source: Hanford Site, www.hanford.gov.
References
1 "Hanford Site," Wikipedia, the free encyclope-
dia, https://en.wikipedia.org/wiki/Hanford_
Site ( July 18, 2018).
2 "Retrieval Activities Completed in Double-
Shell Tank AY-102," Office of River Protection
Newsroom , March 8, 2017, https://www.
hanford.gov/c.cfm/media/attachments.cfm/
ORP/AY-102_retrieval_complete.pdf ( July 18,
2018).
3 "Hanford Tank Integrity Presentation," Han-
ford Advisory Board Tank Waste Committee,
June 19, 2018, https://www.hanford.gov/files.
cfm/Tank_Integrity_Presentation.pdf ( July
18, 2018).
—Ben DuBose
Material Matters continues on
p. 17, following the special NACE
International 75th anniversary section.
Continued f rom page 15